According to Secret Life of the Zoo (season 6, episode 1, aired 31/10/2018) the elephant team and vets decided that Anjan will be Thi's ninth and final calf and they will no longer allow her to breed, throughout the episode they highlighted how difficult this pregnancy was for Thi citing her arthritis as a cause for concern. Given this information it seems as though the breeding programme will come to a natural close as Thi will no longer be bred, Maya is a non breeding female, Indali is too young to breed and is still at risk of EEHV which leaves only Sundara as a breeding female (according to previous SLOTZ episodes she is not the most experienced mum and does not seem to have that close of a relationship with Thi as Sithami did?). Depending on the likelihood of Chester bringing in one or more breeding females (which I do not think is very likely due to seeing Maya on multiple visits and she is always on the outskirts which leads me to believe Thi is not very accepting of outsiders (just my personal opinion)) the breeding programme is likely to come to an end. Depending on the future of the Hi Way family Chester may be able to start over with a new herd of breeding females.